How to distinguish pneumatic valve casting and forging pneumatic valve

pneumatic valve is cast into the pneumatic valve casting, casting of the pneumatic valve pressure levels are generally low, Such as the PN and the PN and the PN, but also have high pressure, can go to the Lb, and Lb, caliber most above all for the DN. Forging is the forging of pneumatic valve, are generally used in high grade pipeline, the relatively small caliber, usually under the DN.

of a, foundry, casting: is the metal smelting as to meet the requirements of a certain liquid is poured into the mold, after cooling solidification, men get a predetermined shape, size and performance of the casting ( The technological process of the parts or blank. The foundation of modern machinery manufacturing industry technology.
, blank casting production cost is low, for complex shape, especially the parts with complex inner cavity, more can show its economical efficiency; At the same time, it has a wide adaptability, and has better comprehensive mechanical properties.
, but casting materials needed for production, Such as metal, wood, fuel, and equipment such as molding materials ( Such as metallurgical furnace, sand mixing machine, molding machine, core making machine, shakeout machine, shot blasting machine, cast iron plate, etc. , and will produce dust and harmful gas and noise and pollution of the environment.
, casting is one of the earlier human master metal hot working process, has some years history. Years BC, Mesopotamia appeared copper casting frog. Between BC and century BC, China has entered the heyday of bronze casting, craft has reached a quite high level, such as the shang dynasty kg SiMuWu square, the warring states period of the statue of yi plate, and through the lens of the western han dynasty is the representative of the ancient casting products. Early casting are greatly influenced by the pottery, casting mostly agricultural production, religion, life aspects such as tools or equipment, color art is thicker. Years BC, China cast out of the world can be found in the earliest written records of cast iron parts - — The state of jin cast ding ( About kg. About A. D. century, Europe began to produce iron castings. Century after the industrial revolution, casting into the great industrial service in the new period. Into the century, the development of casting speed, successively developed nodular cast iron, malleable iron, ultra-low carbon stainless steel and aluminum, copper, aluminum, silicon, aluminum and magnesium alloys such as titanium, nickel base alloy casting metal materials, and the new process of grey cast iron inoculation treatment. S, in the wet sand modelling, high-pressure chemical hardening sand molding and core making, negative pressure molding, and other special casting, blast cleaning, etc. New technology.
, casting a lot of more phyletic, the modelling method is traditionally divided into: (1) ordinary sand mold casting, including green sand mold, dry sand mold and chemical hardening sand mold. (2) special casting, press molding materials and can be divided into natural mineral sand as the main special casting molding materials ( Such as investment casting, mold casting, shell mold casting foundry, negative pressure casting, mold casting, ceramic mold casting and metal as the main casting materials such as the special casting ( Such as metal mold casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc.
and casting process usually includes: (1) cast ( Make liquid metal containers of solid casting, casting according to the materials can be divided into sand mold, metal, ceramic, mud, graphite, etc. , can be divided by use disposable, semi permanent and permanent type, mold preparation quality are the main factors influencing the casting quality; (2) cast metal melting and pouring, casting metal ( Casting alloy mainly include cast iron, cast steel and casting non-ferrous alloy; (3) casting processing and inspection, foreign body casting processing including removal of core and the casting surface, remove poured riser, shovel grinding burrs and phi seam protruding content and heat treatment, such as plastic, rust and rough machining and so on. Imported pneumatic valve pump
2, forging
and forging: is the use of pressure forging machinery for metal blank, make its produce plastic deformation in order to obtain certain mechanical properties, a certain shape and size of forging processing method.
one of two major parts, forging. By forging can eliminate the as-cast osteoporosis of the metal, welded holes, general is better than that of the same material of the casting on the mechanical properties of the forgings. Mechanical load is high, the working conditions of severe important parts, in addition to a simpler shape rolling plate, profile or welding parts are available, use forging more.
and forging press forming method can be divided into: (1) the open-die forging ( Free forging. The use of impact or pressure in two for iron (metal Anvil block between deformation in order to obtain the required forgings, there are mainly manual forging and mechanical forging two kinds. (2) closed model forging. Metal blank in a certain shape in the bore of the forging die forging compression deformation, can be divided into the die forging, cold heading, rotary forging, extrusion, etc. According to the deformation temperature forging can be divided into hot forging ( Processing temperature above the recrystallization temperature of billet metal, forging temperature ( Below the recrystallization temperature and cold forging ( The normal temperature.
and forging materials are mainly components of carbon steel and alloy steel, followed by aluminum, magnesium, titanium, copper and its alloy etc. Material of the original state has a bar, ingot casting, metal powder and liquid metal, etc. Metal in the deformation of the cross-sectional area before and after deformation area is known as the forging ratio. To correctly choose the forging ratio on improving product quality, reduce cost.